How Tumors Adapt to Lack of HIF-1
Author Information
Author(s): Monika Golinska, Helen Troy, Yuen-Li Chung, Paul M McSheehy, Manuel Mayr, Xiaoke Yin, Lucy Ly, Kaye J Williams, Rachel E Airley, Adrian L Harris, John Latigo, Meg Perumal, Eric O Aboagye, David Perrett, Marion Stubbs, John R Griffiths
Primary Institution: Cancer Research UK Cambridge Research Institute
Hypothesis
How do tumors adapt their metabolism in the absence of HIF-1?
Conclusion
HIF-1β deficient tumors maintain normal glycolysis despite lower expression of glycolytic enzymes by allosterically activating PFK-1 due to a high AMP/ATP ratio.
Supporting Evidence
- HIF-1β deficient tumors grew more slowly than wild-type tumors.
- Despite lower expression of glycolytic enzymes, glucose uptake was similar in both tumor types.
- The AMP/ATP ratio was significantly higher in HIF-1β deficient tumors.
- PFK-1 activity was up to two-fold higher in HIF-1β deficient tumors under physiological conditions.
Takeaway
Even when a tumor can't use a specific growth pathway, it can still find a way to get energy and grow by changing how it uses its resources.
Methodology
The study used in vivo tumor models, PET scans, and various biochemical assays to analyze glucose uptake and enzyme activity.
Potential Biases
Potential biases may arise from the specific tumor model used and the methods of measurement.
Limitations
The study primarily focused on a specific tumor model and may not generalize to all cancer types.
Participant Demographics
Mice were used in the study, specifically MF1 athymic nude mice.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
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